Near-ideal electromechanical coupling in textured piezoelectric ceramics

Yongke Yan (), Liwei D. Geng (), Hairui Liu, Haoyang Leng, Xiaotian Li, Yu U. Wang () and Shashank Priya ()
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Yongke Yan: Pennsylvania State University
Liwei D. Geng: Michigan Technological University
Hairui Liu: Pennsylvania State University
Haoyang Leng: Pennsylvania State University
Xiaotian Li: Pennsylvania State University
Yu U. Wang: Michigan Technological University
Shashank Priya: Pennsylvania State University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Electromechanical coupling factor, k, of piezoelectric materials determines the conversion efficiency of mechanical to electrical energy or electrical to mechanical energy. Here, we provide an fundamental approach to design piezoelectric materials that provide near-ideal magnitude of k, via exploiting the electrocrystalline anisotropy through fabrication of grain-oriented or textured ceramics. Coupled phase field simulation and experimental investigation on textured Pb(Mg1/3Nb2/3)O3-Pb(Zr,Ti)O3 ceramics illustrate that k can reach same magnitude as that for a single crystal, far beyond the average value of traditional ceramics. To provide atomistic-scale understanding of our approach, we employ a theoretical model to determine the physical origin of k in perovskite ferroelectrics and find that strong covalent bonding between B-site cation and oxygen via d-p hybridization contributes most towards the magnitude of k. This demonstration of near-ideal k value in textured ceramics will have tremendous impact on design of ultra-wide bandwidth, high efficiency, high power density, and high stability piezoelectric devices.

Date: 2022
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DOI: 10.1038/s41467-022-31165-y

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